 /*
 * AutoSuggest
 * Copyright 2009-2010 Drew Wilson
 * www.drewwilson.com
 * code.drewwilson.com/entry/autosuggest-jquery-plugin
 *
 * Version 1.4   -   Updated: Mar. 23, 2010
 *
 * This Plug-In will auto-complete or auto-suggest completed search queries
 * for you as you type. You can add multiple selections and remove them on
 * the fly. It supports keybord navigation (UP + DOWN + RETURN), as well
 * as multiple AutoSuggest fields on the same page.
 *
 * Inspied by the Autocomplete plugin by: J�rn Zaefferer
 * and the Facelist plugin by: Ian Tearle (iantearle.com)
 *
 * This AutoSuggest jQuery plug-in is dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 */

(function($){
  $.fn.autoSuggest = function(data, options) {
    var defaults = { 
      asHtmlID: false,
      startText: "请输入要搜索的信息",
      emptyText: "没有找到相关资源",
      preFill: { },
      limitText: "不能选择更多的条数",
      selectedItemProp: "title", //name of object property 选中的元素在input中显示的值,如姓名
      selectedValuesProp: "id", //name of object property 选中的元素的实际要传输的值，如id
      searchObjProps: "title", //comma separated list of object property names
      searchRes:{ 'group':'项目组', 'department':'部门', 'user':'用户', 'file':'文件', 'task':'任务', 'knowledge':'知识', 'calendar':'日历', 'postiton':'职位' },
      queryParam: "q",
      specialRes: "",
      retrieveLimit: false, //number for 'limit' param on ajax request
      extraParams: "",
      matchCase: false,
      minChars: 0,  // 置为空，为空时搜索常用值
      keyDelay: 400,
      resultsHighlight: true,
      neverSubmit: false,
      selectionLimit: false,
      showResultList: true,
      // 方法
      start: function(){},
      selectionClick: function(elem){},
      selectionAdded: function(elem){},
      selectionRemoved: function(elem){ elem.remove(); },
      formatList: false, //callback function
      beforeRetrieve: function(string){ return string; },
      retrieveComplete: function(data){ return data; },
      resultClick: function(data){},
      resultsComplete: function(){}
    };
    
    var opts = $.extend(defaults, options);     
    var d_type = "object";
    var d_count = 0;
    if(typeof data == "string") {
      d_type = "string";
      var req_string = data;
    } else {
      var org_data = data;
      for (k in data) if (data.hasOwnProperty(k)) d_count++;
    }
    
    // 正式开始
    if((d_type == "object" && d_count > 0) || d_type == "string"){
      return this.each(function(x){
        if(!opts.asHtmlID){
          x = x+""+Math.floor(Math.random()*100); //this ensures there will be unique IDs on the page if autoSuggest() is called multiple times
          var x_id = "as-input-"+x;
        } else {
          x = opts.asHtmlID;
          var x_id = x;
        }
        opts.start.call(this);
        
        // 绑定的input输入框
        var input = $(this);
        input.attr("autocomplete","off").addClass("as-input").attr("id",x_id).val(opts.startText);
        // 默认input没有获得焦点
        var input_focus = false;
        
        // 初始化 Setup basic elements and render them to the DOM
        input.wrap('<ul class="as-selections" id="as-selections-'+x+'"></ul>').wrap('<li class="as-original" id="as-original-'+x+'"></li>');
        var selections_holder = $("#as-selections-"+x);
        var org_li = $("#as-original-"+x);
        // 下接选择menu
        var results_holder = $('<div class="as-results" id="as-results-'+x+'"></div>').hide();
        var results_ul =  $('<ul class="as-list"></ul>');
        // 选中后的实际值
        var values_input = $('<input type="hidden" class="as-values" name="as_values_'+x+'" id="as-values-'+x+'" />');
        var prefill_value = "";
        // preFill
        if(typeof opts.preFill == "string"){
          var vals = opts.preFill.split(",");          
          for(var i=0; i < vals.length; i++){
            var v_data = {};
            v_data[opts.selectedValuesProp] = vals[i];
            if(vals[i] != ""){
              add_selected_item(v_data, "000"+i);  
            }    
          }
          prefill_value = opts.preFill;
        } else {
          prefill_value = "";
          var prefill_count = 0;
          for (k in opts.preFill) if (opts.preFill.hasOwnProperty(k)) prefill_count++;
          if(prefill_count > 0){
            for(var i=0; i < prefill_count; i++){
              var new_v = opts.preFill[i][opts.selectedValuesProp];
              if(new_v == undefined){ new_v = ""; }
              prefill_value = prefill_value+new_v+",";
              if(new_v != ""){
                add_selected_item(opts.preFill[i], "000"+i);
              }
            }
          }
        }
        if(prefill_value != ""){
          input.val("");
          var lastChar = prefill_value.substring(prefill_value.length-1);
          if(lastChar != ","){ prefill_value = prefill_value+","; }
          values_input.val(","+prefill_value);
          $("li.as-selection-item", selections_holder).addClass("blur").removeClass("selected");
        }
        input.after(values_input);
        selections_holder.click(function(){
          input_focus = true;
          input.focus();
        }).mousedown(function(){ input_focus = false; }).after(results_holder);  //after(results_holder)，初始化搜索列表框

        var timeout = null;
        var prev = "";
        var totalSelections = 0;
        var tab_press = false;
        
        // Handle input field events
        input.focus(function(){      
          if($(this).val() == opts.startText && values_input.val() == ""){
            $(this).val("");
            
            // 值为空，获得焦点时提供默认值
            if (timeout){ clearTimeout(timeout); }
            timeout = setTimeout(function(){ keyChange(); }, opts.keyDelay);
          } else if(input_focus){
            $("li.as-selection-item", selections_holder).removeClass("blur");
            if($(this).val() != ""){
              results_ul.css("width",selections_holder.outerWidth());
              results_holder.show();
            }
          }
          input_focus = true;
          return true;
        }).blur(function(){
          
          if($(this).val() == "" && values_input.val() == "" && prefill_value == "" && input_focus){
            $(this).val(opts.startText);
            //$("li.as-selection-item", selections_holder).addClass("blur").removeClass("selected");
            results_holder.hide();
          } else if(input_focus){
            $("li.as-selection-item", selections_holder).addClass("blur").removeClass("selected");
            results_holder.hide();
            //alert(12345);
          }        
        }).keydown(function(e) {
          // track last key pressed
          lastKeyPressCode = e.keyCode;
          first_focus = false;
          switch(e.keyCode) {
            case 38: // up
              e.preventDefault();
              moveSelection("up");
              break;
            case 40: // down
              e.preventDefault();
              moveSelection("down");
              break;
            case 8:  // delete
              if(input.val() == ""){              
                var last = values_input.val().split(",");
                last = last[last.length - 2];
                selections_holder.children().not(org_li.prev()).removeClass("selected");
                if(org_li.prev().hasClass("selected")){
                  values_input.val(values_input.val().replace(","+last+",",","));
                  opts.selectionRemoved.call(this, org_li.prev());
                } else {
                  opts.selectionClick.call(this, org_li.prev());
                  org_li.prev().addClass("selected");    
                }
                
                if (values_input.val() == ",") {
                  values_input.val("");
                }
              }
              if(input.val().length == 1){
                results_holder.hide();
                 prev = "";
              }
              if($(":visible",results_holder).length > 0){
                if (timeout){ clearTimeout(timeout); }
                timeout = setTimeout(function(){ keyChange(); }, opts.keyDelay);
              }
              break;
            case 9: case 188:  // tab or comma
              tab_press = true;
              var i_input = input.val().replace(/(,)/g, "");
              if(i_input != "" && values_input.val().search(","+i_input+",") < 0 && i_input.length >= opts.minChars){  
                e.preventDefault();
                var n_data = {};
                n_data[opts.selectedItemProp] = i_input;
                n_data[opts.selectedValuesProp] = i_input;                                        
                var lis = $("li", selections_holder).length;
                add_selected_item(n_data, "00"+(lis+1));
                input.val("");
              }
            case 13: // return
              tab_press = false;
              var active = $("li.active:first", results_holder);
              if(active.length > 0){
                active.click();
                results_holder.hide();
              }
              if(opts.neverSubmit || active.length > 0){
                e.preventDefault();
              }
              break;
            default:
              // 输入数据（特殊键除处）开始搜索
              if(opts.showResultList){
                if(opts.selectionLimit && $("li.as-selection-item", selections_holder).length >= opts.selectionLimit){
                  results_ul.html('<li class="as-message">'+opts.limitText+'</li>');
                  results_holder.show();
                } else {
                  if (timeout){ clearTimeout(timeout); }
                  timeout = setTimeout(function(){ keyChange(); }, opts.keyDelay);
                }
              }
              break;
          }
        });
        
        // do search
        function keyChange() {
          // ignore if the following keys are pressed: [del] [shift] [capslock]
          if (typeof lastKeyPressCode != "undefined") {
            if( lastKeyPressCode == 46 || (lastKeyPressCode > 8 && lastKeyPressCode < 32) ){ return results_holder.hide(); }
          }
          var string = input.val().replace(/[\\]+|[\/]+/g,"");
          if (string != "" && string == prev) return;
          prev = string;
          if (string.length >= opts.minChars) {
            selections_holder.addClass("loading");
            if(d_type == "string"){
              var limit = "";
              if(opts.retrieveLimit){
                limit = "&limit="+encodeURIComponent(opts.retrieveLimit);
              }
              if(opts.beforeRetrieve){
                string = opts.beforeRetrieve.call(this, string);
              }
              var postUrl;
              if (opts.specialRes != "") {
                postUrl = req_string+"?res="+opts.specialRes+'&'+opts.queryParam+"="+encodeURIComponent(string)+limit+opts.extraParams;
              } else {
                postUrl = req_string+"?"+opts.queryParam+"="+encodeURIComponent(string)+limit+opts.extraParams;
              }
              $.getJSON(postUrl, function(data){ 
                d_count = 0;
                var new_data = opts.retrieveComplete.call(this, data);
                for (k in new_data) if (new_data.hasOwnProperty(k)) d_count++;
                if (d_count == 0 && prev == '') {
                  return false;
                } else {
                  processData(new_data, string);
                }
              });
            } else {
              if(opts.beforeRetrieve){
                string = opts.beforeRetrieve.call(this, string);
              }
              processData(org_data, string);
            }
          } else {
            selections_holder.removeClass("loading");
            results_holder.hide();
          }
        }

        var num_count = 0;
        // 用搜索结果拼装下拉菜单
        function processData(data, query){
          // 如果不区分大小写，则全转为小写
          if (!opts.matchCase){ query = query.toLowerCase(); }
          // 取得的种类
          var mathTypeNum   = 0;
          // 取得的数据数量
          var matchCount = 0;
          
          results_holder.html(results_ul.html("")).hide();
          var num = 0;
          for (var i in data) {
            // 过滤无需的搜索
            if (opts.searchRes[i] == "undefined") {
              continue;
            }
            // i相当于user,group,department等
            // j相当于0,1,2,3等
            // data[i][j][name]即取得所需值
            for (var j in data[i]) {
              num_count++;
              var forward = false;
              if(opts.searchObjProps == "value") {
                var str = data[i][j].value;
              } else {
                var str = "";
                var names = opts.searchObjProps.split(",");
                for(var y=0; y<names.length; y++){
                  var name = $.trim(names[y]);
                  str = str+data[i][j][name]+" ";
                }
              }
              
              if(str){
                if (!opts.matchCase){ str = str.toLowerCase(); }        
                if(str.search(query) != -1 && values_input.val().search(","+data[i][j][opts.selectedValuesProp]+",") == -1){
                  forward = true;
                }  
              }

              if(forward){
                var formatted = $('<li class="as-result-item" id="as-result-item-'+num+'"></li>').click(function(){
                    // 取绑定的数据
                    var raw_data = $(this).data("data");
                    var number = raw_data.num;
                    if($("#as-selection-"+number, selections_holder).length <= 0 && !tab_press){
                      var data = raw_data.attributes;
                      input.val("").focus();
                      prev = "";
                      add_selected_item(data, number);
                      opts.resultClick.call(this, raw_data);
                      results_holder.hide();
                    }
                    tab_press = false;
                  }).mousedown(function(){ input_focus = false; }).mouseover(function(){
                    $("li", results_ul).removeClass("active");
                    $(this).addClass("active");
                    
                    //.data('data', { })li上绑定数据
                  }).data("data",{attributes: data[i][j], num: num_count});
                
                var this_data = $.extend({},data[i][j]);
                if (!opts.matchCase){ 
                  var regx = new RegExp("(?![^&;]+;)(?!<[^<>]*)(" + query + ")(?![^<>]*>)(?![^&;]+;)", "gi");
                } else {
                  var regx = new RegExp("(?![^&;]+;)(?!<[^<>]*)(" + query + ")(?![^<>]*>)(?![^&;]+;)", "g");
                }
                
                if(query != "" && opts.resultsHighlight){
                  this_data[opts.selectedItemProp] = this_data[opts.selectedItemProp].replace(regx,"<em>$1</em>");
                }
                
                if(!opts.formatList){
                  formatted = formatted.html('<span style="color:red;">'+opts.searchRes[i]+':</span> '+this_data[opts.selectedItemProp]);
                } else {
                  formatted = opts.formatList.call(this, this_data, formatted);  
                }
                results_ul.append(formatted);
                delete this_data;
                matchCount++;
                if(opts.retrieveLimit && opts.retrieveLimit == matchCount ){ break; }
              }
              
              num++;
            }
          }
            //////////////////////////////
          //}
          selections_holder.removeClass("loading");
          // 如果搜索结果为空
          if(matchCount <= 0){
            results_ul.html('<li class="as-message">'+opts.emptyText+'</li>');
          }
          results_ul.css("width", selections_holder.outerWidth());
          results_holder.show();
          opts.resultsComplete.call(this);
        }
        
        // 选中某元素时，表单中加入数据
        function add_selected_item(data, num){
          if (values_input.val() == "") {
            values_input.val(','+data[opts.selectedValuesProp]+",");
          } else {
            values_input.val(values_input.val()+data[opts.selectedValuesProp]+",");
          }
          var item = $('<li class="as-selection-item" id="as-selection-'+num+'"></li>').click(function(){
              opts.selectionClick.call(this, $(this));
              selections_holder.children().removeClass("selected");
              $(this).addClass("selected");
            }).mousedown(function(){ input_focus = false; });
          var close = $('<a class="as-close">&times;</a>').click(function(){
              values_input.val(values_input.val().replace(","+data[opts.selectedValuesProp]+",",","));
              if (values_input.val() == ",") {
            	  values_input.val("");
              }
              opts.selectionRemoved.call(this, item);
              input_focus = true;
              input.focus();
              return false;
            });
          org_li.before(item.html(data[opts.selectedItemProp]).prepend(close));
          opts.selectionAdded.call(this, org_li.prev());  
        }
        
        // 上下键移动鼠标位置
        function moveSelection(direction){
          if($(":visible",results_holder).length > 0){
            var lis = $("li", results_holder);
            if(direction == "down"){
              var start = lis.eq(0);
            } else {
              var start = lis.filter(":last");
            }          
            var active = $("li.active:first", results_holder);
            if(active.length > 0){
              if(direction == "down"){
              start = active.next();
              } else {
                start = active.prev();
              }  
            }
            lis.removeClass("active");
            start.addClass("active");
          }
        }
      });
    }
  }
})(jQuery);